package com.linran.utils.utils;

import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 客户端
 *
 * 通过RequestConfig设置超时时间
 * @author lin
 * @date 2020-05-02 17:56
 *
 *         <dependency>
 *             <groupId>org.apache.httpcomponents</groupId>
 *             <artifactId>httpclient</artifactId>
 *             <version>4.5.2</version>
 *         </dependency>
 */
public class HttpClientUtils {

    private static final String DEFAULT_CODE = "UTF-8";

    public static String doGet(String url, Map<String, String> params) {
        String resultString = "";
        //创建HttpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;

        try {
            //创建uri
            URIBuilder builder = new URIBuilder(url);
            if (params != null) {
                for (String key : params.keySet()) {
                    builder.addParameter(key, params.get(key));
                }
            }
            URI uri = builder.build();

            //创建http GET
            HttpGet httpGet = new HttpGet(uri);

            //设置header
            //httpGet.setHeader();

            //执行请求
            response = httpClient.execute(httpGet);
            //判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == HttpServletResponse.SC_OK) {
                resultString = EntityUtils.toString(response.getEntity(), DEFAULT_CODE);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }

    public static String doPostForm(String url, Map<String, String> param) {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);
            // 创建参数列表
            if (param != null) {
                List<NameValuePair> paramList = new ArrayList<>();
                for (String key : param.keySet()) {
                    paramList.add(new BasicNameValuePair(key, param.get(key)));
                }
                // 模拟表单
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList, DEFAULT_CODE);
                httpPost.setEntity(entity);
            }
            //设置header
            //httpPost.setHeader();
            // 执行http请求
            response = httpClient.execute(httpPost);
            resultString = EntityUtils.toString(response.getEntity(), DEFAULT_CODE);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }

    public static String doPostJson(String url, String json) {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);
            // 创建请求内容
            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
            httpPost.setEntity(entity);
            // 执行http请求
            response = httpClient.execute(httpPost);
            resultString = EntityUtils.toString(response.getEntity(), DEFAULT_CODE);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }

    public static void main(String[] args) {
        Map<String, String> params = new HashMap<>();
        params.put("param","get请求参数");
        System.out.println(doGet("http://localhost:8080/test/get",params));
        params.put("keyName","你好");
        System.out.println(doPostJson("http://localhost:8080/test", "{\"content\":\"内容\"}"));
        System.out.println(doPostForm("http://localhost:8080/test/form",params));
/*      @PostMapping(value = "/form", produces = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
        public Object postForm(String keyName){
            return "postForm:"+keyName;
        }*/
    }
}
